Simply put. It doesn’t work. But vnc can be set up with the description here. And it is the same as x11vnc (controlling the desktop rather than another vnc).
x11vnc on jetson
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Day: May 15, 2022
Barrier host on 18.04
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Spent several hours before realized that Barrier doesn’t not work on 18.04 as host. Should have checked “show log” earlier and that would allow me to figure out earlier. Online it said 18.04 will work for barrier-maxiberta. But snap install can’t find barrier-maxiberta. If I snap install barrier, it results in an authentication error.